Hello UA Friends!

I have am interesting situation and looking for some help. I recently won 2 round trip airline e-certificates in a silent auction that expire on Nov. 1 of this year. I had planned to use them for a vacation to Cancun that my wife and I were planning, but come to find out, the certificates are only good for "Booking Class K" tickets and no tickets are available to Cancun for our dates and K class. The e-certificates are good for any roundtrip flight in the lower 48, Alaska, Canada, Caribbean, Central America, or Mexico. My only two options that I see now are to take a fun weekend trip somewhere (neither of us can take off more work between now and Nov.1) or try to sell them and make back at least some of my money that I spent on them.

Question 1: is it possible to search for a flight by booking class with no destination selected? I don't really have any particular place in mind to get away for a weekend, so just trying to find what options we might have by just searching on a particular date and Booking Class K.

Thank you in advance for the help!